fj40 carb cooling fan...do you run yours? (16 Viewers)

[Ackcruisers]

Thanks for looking into this @Brian/99uzj100. Much appreciated. I’ve ordered many variations of thermo snap switches ranging from 70 degrees Celsius up to 85. Based on the “caution” statement, it looks like 80 degrees Celsius is the spec for the 1976/77 California spec carb cooling fan stock switch.

 

[Ackcruisers]

Made my own carb cooling fan snap switch and bracket.

 

[myquestoyota]

What components are you using?

 

[Ackcruisers]

What components are you using?

I am running a Carb Fan 16360-61023 with a 85927-60010 controller/computer timer connected to my home made snap switch as shown. Works perfectly.

 

[myquestoyota]

I have the fan but am curious about your snap switch

 

[fjwagon]

I will take a guess, it's been years since I worked on mine. What I found at the end to get it working was several components in the timer assembly had several cold solder joints. Anyhow the snap switch is like a thermistor, the timer will go to ground once the threshold is met (manifold gets hot, 85*C, you can the it on the snap switch) and the key goes to off position to set the timer motion to get the fan to come on.

 

[Ackcruisers]

Providing some additional details for those wanting to make their own. First, there are different fan controllers over the years. The early controller (1976/77); where the fan was located in the front of the truck. This controller is pretty simple. It uses a snap thermo switch. This set up will also work with the side mounted fan.

The snap switches are readily available. Look for the ceramic stainless steel version. You want the version that is NO (normally open). They come in different temp ranges 70/80/85+ degrees Celsius. When circuit closes it sends power to the timer controller to activate the fan.

The later year controllers use a different thermo sensor as shown.

 

[Ackcruisers]

Here is a video. I retrofitted this fan set-up for my 1976 FJ40. I made a small sub harness that connected to the early fan controller. I was able to use wiring IGN and GROUND wires from the unused emissions computer to easily connect the wires to controller and mounted it on drivers side firewall.